ORCID Profile
0000-0002-1666-0543
Current Organisation
Nova Southeastern University
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Publisher: Elsevier BV
Date: 10-2006
Publisher: Public Library of Science (PLoS)
Date: 30-04-2012
Publisher: Elsevier BV
Date: 09-2015
Publisher: Frontiers Media SA
Date: 07-08-2017
Publisher: Association for Research in Vision and Ophthalmology (ARVO)
Date: 05-2003
DOI: 10.1167/IOVS.02-0373
Abstract: To compare the magnitude and time course of nearwork-induced transient myopia (NITM) in preadolescent Hong Kong Chinese myopes and emmetropes. Forty-five Hong Kong Chinese children, 35 myopes and 10 emmetropes aged 6 to 12 years (median, 7.5), monocularly viewed a letter target through a Badal lens for 5 minutes at either 5.00- or 2.50-D accommodative demand, followed by 3 minutes of viewing the equivalent target at optical infinity. Accommodative responses were measured continuously with a modified, infrared, objective open-field autorefractor. Accommodative responses were also measured for a countercondition: viewing of a letter target for 5 minutes at optical infinity, followed by 3 minutes of viewing the target at a 5.00-D accommodative demand. The results were compared with tonic accommodation and both subject and family history of refractive error. Retinal-blur-driven NITM was significantly greater in Hong Kong Chinese children with myopic vision than in the emmetropes after both near tasks, but showed no significant dose effect. The NITM was still evident 3 minutes after viewing the 5.00-D near task for 5 minutes. The magnitude of NITM correlated with the accommodative drift after viewing a distant target for more than 4 minutes, but was unrelated to the subjects' or family history of refractive error. In a preadolescent ethnic population with known predisposition to myopia, there is a significant posttask blur-driven accommodative NITM, which is sustained for longer than has previously been found in white adults.
Publisher: Association for Research in Vision and Ophthalmology (ARVO)
Date: 09-03-2007
DOI: 10.1167/7.2.10
Publisher: Elsevier BV
Date: 03-2006
Publisher: Elsevier BV
Date: 03-2008
Publisher: Association for Research in Vision and Ophthalmology (ARVO)
Date: 29-04-2020
DOI: 10.1167/JOV.20.4.24
Publisher: Informa UK Limited
Date: 2003
DOI: 10.1076/CEYR.26.2.65.14513
Abstract: While intraocular pressure has been shown to have some influence on eye growth, the stress exerted on the outer wall of the eye and the rigidity of the outer coats of the eye may be of greater importance. No studies have assessed the significance of both of these variables in terms of childhood myopia and its progression. Twenty myopic and twenty non-myopic children aged 8 to 12 years participated in the study. Refractive error (including refractive error shift over the past year), ocular dimensions (anterior chamber, lens thickness, vitreous chamber, axial length), intraocular pressure, equatorial scleral rigidity, and outer wall thickness were measured for right eyes. Outer wall stress was calculated using the approximation, p = IOP*r/2t. The myopic group was 3.43 D more myopic and had 1.43 mm longer eyes on average than the non-myopic group. The myopic children had experienced a mean refractive shift of -0.30 D/yr over the past year. Equatorial wall thickness was significantly less in myopes than non-myopes (difference of 0.09 mm, p = 0.02) and in the combined s le was correlated to refractive error (r = 0.312, p = 0.05), but not refractive error shift. Ocular rigidity and eye wall stress values were similar in the two groups. The refractive shift increased as wall stress increased both in the combined s le (r = -0.386, n = 35, p = 0.022) and the myopic group (r = -0.600, n = 16, p = 0.014). We did not find large differences in wall thickness, ocular rigidity, or wall stress in myopic and non-myopic children. While reduced ocular rigidity, increased wall stress and scleral thinning may have a role in myopia progression in childhood we were not able to clearly show this in our study of 40 children.
Publisher: Elsevier BV
Date: 2002
DOI: 10.1016/S0042-6989(01)00277-2
Abstract: There is some suggestion that the ability to detect blur may be altered in adults with myopia. Here, we address the question of whether children with myopia have worse blur detection than other children, and whether blur detection in myopic children is related to the rate of myopia progression. We recruited 20 myopes and 20 non-myopes aged between 8 and 12 years. Refractive errors, visual acuity, and contrast sensitivity were measured and the change in refractive error over the past year calculated from clinic records. Blur detection thresholds for two different types of black and white targets (text and scenes), two illumination conditions and two testing protocols were determined using a computer-based forced-choice testing procedure. The two testing protocols used were: (i) dual image presentation where subjects were asked to choose the clearer of the two images, one image always having zero blur, and (ii) single image presentation in which the subject reported whether the image was clear or blurred. Blur discrimination ability under all tested conditions was similar for both refractive error groups. Blur detection thresholds were 0.27+/-0.15 D (myopes) and 0.24+/-0.07 D (non-myopes) for text images. Thresholds were similar when measured with a one log unit reduction in lighting: 0.27+/-0.31 D compared to 0.23+/-0.14 D. Blur detection thresholds were greater for photographic scenes (myopes 0.41+/-0.36 D, non-myopes 0.44+/-0.36 D) and when only a single text image (myopes 0.51+/-0.21 D, non-myopes 0.59+/-0.01 D) was presented, but this increase was measured in both refractive error groups. There was no correlation between blur thresholds and refractive error magnitude, refractive error progression over the past year, or contrast sensitivity. We found that the blur detection ability showed greater in idual variation in myopic children. Further work is required to determine whether blur detection ability is of relevance to myopia development.
Location: United States of America
No related grants have been discovered for Roger Li.